Comparison Analysis of Soil Available Nutrient's Difference of Third-generation Seed Orchard of Cunninghamia lanceolata at Different Slope Direction

The third-generation seed orchard of Cunninghamia lanceolata was acted as research objects,the differences of soil available nutrient content at different slope were analyzed in this paper,so as to lay a foundation for reasonable fertilization to the third-generation seed orchard of C.lanceolata.The results showed that at the same slope direction,with the rising of the slope position and the increase of soil depths,soil available nutrient content of the third-generation seed orchard of C.lanceolata decreased gradually;At different slope direction with the same slope position and soil depths had complex effect on soil available nutrient content of the third-generation seed orchard of C.lanceolata.